During the pandemic lockdown, technology and screens became a lifeline as we shifted to virtual schooling, working from home, and connected to friends and family remotely. But as online screen time increased, so did parents' concerns about their children's mental and physical health and the adverse effects of advertising and social media. So, what has been the impact of all this extra screen time, particularly on children? We asked Mayo Clinic pediatrician Dr. Nusheen Ameenuddin.